I can hardly believe no one has sung the praises of RIG. It has been my standby rust preventative on guns for years. RIG is the one grease I have used that has never allowed a black powder barrel bore to rust, and that is the acid test, IMO. I do not use it for a lubricant but it is the best rust preventative for bores and exterior metal parts I have ever found. I don't know how many years it will remain on metal without evaporating, but it's a lot.

May God bless America and those who defend her.